US7755317B2 - Methods for electric vehicle motor control and rotor position detection fault-tolerant processing - Google Patents
Methods for electric vehicle motor control and rotor position detection fault-tolerant processing Download PDFInfo
- Publication number
- US7755317B2 US7755317B2 US11/951,305 US95130507A US7755317B2 US 7755317 B2 US7755317 B2 US 7755317B2 US 95130507 A US95130507 A US 95130507A US 7755317 B2 US7755317 B2 US 7755317B2
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- Prior art keywords
- rotor position
- motor
- error
- sampled
- fault
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/05—Determination of the rotor position by using two different methods and/or motor models
Definitions
- This invention involves methods related to motor rotor, and, in particular, to detection of motor rotor position and to fault-tolerant processing with respect to the motor and motor rotor.
- the existing technology uses a revolver to detect rotor rotational position and send out a simulation signal.
- the digital signal quantity is calculated through a specific decoding chip.
- the vehicle speed can be calculated by the ECU of the electric vehicle based on the current position signal and the previous position signal.
- the necessary increase in driver voltage for the electric motor rotor can be computed.
- the driver signal for the revolver can be determined.
- the revolver can provide the preset three-phase AC voltage to the stator winding of the electric motor based on the driver signal.
- the sampled position angle is considered incorrect and the current sampled position angle signal is discarded. Then a different strategy is employed to deal with the erroneous angle where a correct speed value obtained based on the last sampled rotor position is used to correct the current sampled speed value resulting in a corrected current rotor position angle. Lastly the correcting value is used to control the electric motor.
- the main purposes of this invention are: to provide safe, stable, and reasonable motor control methods and motor rotor position detection fault-tolerant processing methods. When the electric vehicle motor rotor position detection is faulty, these methods can still determine a corresponding correct and reasonable stator voltage control strategy to prevent the electric motor operation from unsafe conditions such as motor fluctuation or loss of control.
- the electric motor control ECU uses the current rotor position angle ⁇ 1 to compare with the previous rotor position angle ⁇ 0 to determine if the difference is within a reasonable range. Since the electric motor rotor position cannot tolerate a sizable increase within a short period of time, therefore, it can determine whether the current sampled rotor position is correct or not. If there is a sudden change in the rotor position, the sampled position signal is determined to be in error and it is discarded. Then a fault-tolerant processing strategy is employed where the previous sampled rotor position ⁇ 0 is used as a base to determine the corrected current rotor position angle ⁇ 1 ′. Then a correcting value is used to control the electric motor.
- the fault-tolerant processing strategy of this invention can ensure safe operation by effectively preventing the motor from losing control and allow it to maintain its continuity and stability.
- Another purpose of the invention is to provide a type of motor rotor position control device.
- Said device include a correct rotor position comparing module that is used to compare the sampled correct rotor position and the calculated rotor position obtained when there is an error. It determines whether the difference between the sampled correct rotor position and the calculated rotor position obtained when there is an error is greater than the specified motor rotor position limit.
- FIG. 1 is a simplified structural diagram for the electric vehicle electric driver system of an embodiment of this invention.
- FIG. 2 is a control flow diagram of an embodiment of the present invention.
- FIG. 3 is a flow chart of the motor rotor position control method provided by an embodiment of this invention.
- FIG. 4 is a flow chart of the motor rotor position control method implementation example provided by an embodiment of this invention.
- FIG. 5 is a structural diagram of a motor rotor position control device provided by an embodiment of this invention.
- the main purposes of this invention are: to provide safe, stable, and reasonable motor control methods and motor rotor position detection fault-tolerant processing methods. When the electric vehicle motor rotor position detection is faulty, these methods can still determine a corresponding correct and reasonable stator voltage control strategy to prevent the electric motor operation from unsafe conditions or operations such as motor fluctuation or loss of control.
- the preferred embodiment of this invention provides electric vehicle motor control methods that include the following steps:
- the rotor position angle correcting value is used to adjust the PWM waveform and change the three-phase voltage added on the motor to control motor operation.
- the implementation of rotor position detection includes: a revolver is used to acquire motor rotor position signal that is then sent to a revolver decoding unit. Then the revolver decoding unit decodes the signal and calculates the current rotor position angle ⁇ 1 .
- the correct speed value calculated from the previous sampling period is used as the current sampled speed value. If the number of errors does not exceed the fault-tolerant limit within an assigned statistical time, then the counter clears and restarts to record at zero.
- a counter starts to record at the first error incident and when the number of erroneous rotor position angle incidents reaches the fault-tolerant limit within an assigned statistical time, then it is determined that the hardware system failed.
- the present invention provides a type of electric vehicle rotor position detection fault-tolerant processing method includes the following procedures:
- the current rotor position angle ⁇ is compared with the previous sampled rotor position angle ⁇ 0 .
- step 63 the correct speed value calculated from the previous sampling period is used as the current sampled speed value.
- a counter starts to record from the first error incident and when the number of erroneous rotor position angle incidents reaches the fault-tolerant limit within an assigned statistical time, then it is determined that the hardware system failed. If the number of errors does not exceed the fault-tolerant limit within an assigned statistical time, then the counter clears and restarts to record from zero.
- the assigned statistical time is 3 minutes and the fault-tolerance frequency limit is 4.
- the electric motor control ECU uses the current rotor position angle ⁇ 1 to compare with the previous rotor position angle ⁇ 0 to determine if the difference is within a reasonable range. Since the electric motor rotor position cannot have a sizable increase within a short period of time, therefore, it can be determined whether the current sampled rotor position is correct or not. If there is a sudden change in that position, the sampled position signal is determined to be in error and it is discarded. Then a fault-tolerant processing strategy is employed where the previous sampled rotor position ⁇ 0 is used as a base to determine the corrected current rotor position angle ⁇ 1 ′.
- the fault-tolerance processing strategy of this invention can ensure safe operation by effectively preventing the motor from losing control and allow it to maintain its continuity and stability.
- the motor control unit can stop the motor operation to prevent further damage and ensure system safety.
- the purpose of the embodiments of this invention is to provide motor rotor position control methods that aim to resolve an existing technology issue: when the motor rotor position continues to be in error, the sampled correct rotor position is directly used to control the motor which causes the motor rotational speed to increase at a greater pace. As a result, the change in the electric current may be large as well, leading to damages to power components.
- the sampled correct rotor position and the calculated rotor position obtained when there is an error are compared. Then whether the difference between the sampled correct rotor position and the calculated rotor position obtained when there is an error is greater than the particular specified motor rotor position limit is determined. If the difference between the sampled rotor position and the calculated rotor position obtained when there is an error (also referred to as calculated-with-error rotor position) exceeds the specified motor rotor position limit, the sampled correct rotor position is discarded.
- Another purpose of the invention embodiment is to provide a type of motor rotor position control device.
- Said device include a correct rotor position comparing module that is used to compare the sampled correct rotor position and the calculated rotor position obtained when there is an error. It determines whether the difference between the sampled correct rotor position and the calculated rotor position obtained when there is an error is greater than the specified motor rotor position limit.
- a correct rotor position processing module is used to discard the sampled correct rotor position when the difference between the sampled rotor position and the calculated-with-error rotor position exceeds the specified motor rotor position limit.
- a position correcting module is used to compute the summation between the calculated-with-error rotor position and the maximum value of the specified rotor position limit. That summation is used as a correcting value to control motor operation.
- This invention embodiment compares the sampled correct rotor position with the calculated-with-error rotor position. When the difference between the sampled correct rotor position and the calculated-with-error rotor position exceeds the particular specified rotor position limit, then the sampled correct rotor position is discarded. Then the summation between the calculated-with-error rotor position and the maximum value of the specified rotor position limit is computed. That summation is used as a correcting value to control the motor operation.
- This invention solves the existing technology issue where the sampled rotor position is used directly to control the motor when the rotor position continues to be in error.
- FIG. 1 is a simplified structural diagram of the electrical motor system of an electric vehicle that is an embodiment of this invention.
- the electric vehicle electric driver system of the embodiment includes: a battery pack 1 , an inverter unit 2 , a revolver decoding unit 3 , an optoisolator 4 , a motor control unit 5 , an electric motor 6 , and a revolver 7 .
- the battery pack 1 uses a high-power battery pack with a voltage 200V-330V which is the energy source of the entire electric driver system.
- the motor control unit 5 is used to calculate the PWM signal which is sent to the inverter 2 through the driver isolation unit.
- the inverter 2 is comprised of three IPM (IGBT can also be used as a type of power components transistors).
- the IPM is divided into top and bottom bridges and the three IPM top bridge input is connected to the positive terminal of the battery pack 1 .
- the bottom bridge is connected to the negative terminal of battery pack 1 .
- Each connection point between each IPM is connected to the three-phase coil (U-phase, V-phase, W-phase) of the electric motor 6 .
- the electric motor 6 is a PMSM (permanent magnetism synchronous machine) that is used as the electric vehicle power output source.
- the revolver 7 is connected to the electric motor 6 rotor and is used to detect the rotational angle position of the electric motor 6 rotor and send the position to the revolver decoding unit 3 .
- the revolver decoding unit 3 receives the signal from the revolver 7 to decode the rotor position and sends it to the connected motor control unit 5 .
- the revolver detects the motor rotor position during a sampling cycle T 1 . Its detected signal is sent to the revolver decoding unit. The revolver decoding unit is responsible for decoding that signal to calculate the current rotor position ⁇ 1 . This position value is sent to the motor control unit where it is compared with the previous sampled rotor position angle ⁇ 0 .
- the current sampled position signal is not within the specified rotor angle limit based on the previous position signal, then the current revolver sampled data is considered an error because the rotor position cannot have a steep change within a very short sampling period. From the outside view, the vehicle cannot have a sudden speed change within a short period of time.
- the PWM waveform used to control the motor is based on the current sampled data, the vehicle control can become unstable. For instance, if the revolver sampled data is in error when the vehicle advances in the D (drive) block, the decoded rotor angle may appear to be in reverse. In other words, if the control PWM waveform is computed based on erroneous position data, then the entire vehicle can be in great danger which is not a desired situation.
- the sampled data processing is based on a judgment of erroneous data. Based on the reason that the rotor position cannot have sudden changes, that particular data is discarded when the revolver sampled data is in error. But in the mean time, a control waveform must still be given to ensure the motor is not out of control and unstable condition does not occur. Based on the above reasons, since the sampling period in this example is extremely short which is 20 ⁇ m and it is during this short period of time that the vehicle speed cannot have sudden changes, therefore the correct speed value calculated from the previous sampling period is used to replace the current sampling calculated speed value. This will not affect the accuracy of the overall calculation. On the contrary it can help calculate the rotor position for this very moment which in turn can ensure control continuity and stability. This corrected angle value is used to adjust the PWM waveform and change the voltage provided to the motor three-phase to control the motor operation.
- another embodiment of the present invention compares the sampled correct rotor position with the calculated rotor position obtained when there is an error (or “calculated-with-error rotor position”). When the difference between the sampled correct rotor position and the calculated-with-error rotor position exceeds than the specified rotor position limit, then the sampled correct rotor position is discarded. It then computes the summation between the calculated-with-error rotor position and the maximum value of the specified rotor position limit. That summation is used as a correcting value to control the motor operation.
- FIG. 3 shows a flow of the motor rotor position control method provided by an embodiment of this invention.
- step S 101 it compares the sampled correct rotor position with the calculated-with-error rotor position. It then determines whether the difference between the sampled correct rotor position and the calculated-with-error rotor position is greater than the specified motor rotor position limit.
- the revolver can detect the motor rotor position angle signal and through the decoder the value of the motor rotor position can be obtained.
- the current motor rotor position can be calculated.
- the correct motor rotor position appears, the correct rotor position is acquired.
- that correct motor rotor position and the calculated rotor position obtained when there is an error are acquired through the revolver internal decoding chip.
- that decoding chip it has a signal pin that can indicate the reception of the correct rotor position once the correct rotor position appears.
- the calculated-with-error rotor position is the calculated-with-error motor rotor position obtained just before acquiring the correct rotor position.
- the maximum value is obtained by carrying out motor experiments. That is through testing the different position value that the particular motor can withstand. When the value exceeds the maximum value, it will cause an overly large electric current that can result in damages to the motor power components.
- the worst maximum value is related to the difference value that can be tolerated by the power components connected to that motor. When that maximum value is exceeded, it can cause abnormal power components operation. Certainly, that maximum value is also linked to the passenger riding comfort; if the maximum value is too large, the riding comfort is not as good to the passengers.
- step S 102 is processed and the sampled correct rotor position is used to control the motor operation.
- step S 103 is processed. It computes the summation between the calculated-with-error rotor position and the maximum value of the specified motor rotor position limit.
- step S 104 uses the summation value as the correcting value to control the motor operation. In other words, it uses that value to adjust the PWM waveform to change the three-phase voltage added on the motor to control the motor operation.
- the next time when the motor rotor position continues to be in error and acquires a correct rotor position uses that value as the calculated-with-error rotor position and continues to compare it to the current sampled correct rotor position when there is an error.
- the revolver internal decoding chip acquires a correct rotor position.
- the decoding chip interior has a signal pin which indicates the correct rotor position has been obtained once the correct rotor position appears. If the sampled correct rotor position is 2000, before acquiring the correct rotor position which is also when the motor rotor position continues to be in error, the calculated rotor position is 1800.
- the specified motor rotor position limit maximum value is 80.
- the sampled correct rotor position for the next cycle is 2010, the difference between 2010 and 1960 is 50 which does not exceed the specified motor rotor position limit maximum value of 80. Then the sampled correct rotor position 2010 is used to control the motor operation.
- the sampled correct motor rotor position is assessed and corrected. It helps to prevent the motor electric current and rotational speed from having sudden changes. It can also ensure the motor control continuity and can improve the comfort of the vehicle ride.
- the maximum value for the electric current rate of change that motor can withstand is determined through experiment testing. When this maximum value is exceeded, it can lead to damages to the power components. Thus through the maximum value for the electric current rate of change, it can determine the scope of the position difference ⁇ that this particular motor rotor position can withstand.
- the ⁇ 0 is compared with the maximum of the preset ⁇ , ⁇ max . If it is smaller than maximum value ⁇ max , then the correct rotor position ⁇ 1 can be used directly as the sampled value to control that particular motor.
- This amended value is used as the correcting value to control that particular motor operation.
- FIG. 4 only shows a process cycle of an embodiment of this invention after the correct rotor position is sampled.
- the starting value n begins a new cycle from 0.
- FIG. 5 shows a structure of the motor rotor position control devices provided by an embodiment of this invention.
- that correct motor rotor position and the calculated rotor position when there is an error are sampled through the resolver's internal decoding chip 11 .
- that decoding chip it has a signal pin that can indicate the reception of the correct rotor position once the correct rotor position appears.
- the correct rotor position comparing module 12 compares the sampled correct rotor position and the calculated-with-error rotor position. Then it determines whether the difference between the sampled correct rotor position and the calculated-with-error rotor position is within that specified motor rotor position limit.
- the correct rotor position control module 13 uses that sampled correct rotor position as the control value for the motor rotor position.
- the correct rotor position processing module 14 discards the sampled correct rotor position.
- the position correcting module 15 calculates the summation between the calculated-with-error rotor position and the maximum value of the specified motor rotor position limit. That summation is used as the correcting value to control the motor operation.
- the embodiment of this invention compares the sampled correct rotor position with the calculated-with-error rotor position. When the difference between the sampled correct rotor position and the calculated-with-error rotor position exceeds the specified motor rotor position limit, then the sampled correct rotor position is discarded. The summation between the calculated-with-error rotor position and the maximum value of the motor rotor position specified limit is calculated. That summation is used as the correcting value to control the motor operation.
- This invention solves an existing technology issue where the sampled rotor position is used directly to control the motor when the rotor position is in error continuously. This results in a greater increase in the motor rotational speed leading to an overly large electric current rate of change that causes damage to power components.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Electric Motors In General (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
θ1′=θ0+Δθmax
when n=0, Δθ=θ1−θ′0=θ1−θ0, θ′1=θ0+θMAX;
when n=1, Δθ=θ2−θ′1=θ2−(θ0+θMAX), θ′2=θ′1+θMAX; and
when n=2, Δθ=θ3−θ′2=θ3−(θ0+θMAX+θMAX), θ′3=θ′2+θMAX.
Claims (18)
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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CN200610157298.2 | 2006-12-05 | ||
CNA2006101572982A CN101197555A (en) | 2006-12-05 | 2006-12-05 | Electric car motor control method and fault-tolerance processing method for its rotor position detection |
CN200610157298 | 2006-12-05 | ||
CN200710076826 | 2007-08-30 | ||
CN2007100768266A CN101378239B (en) | 2007-08-30 | 2007-08-30 | Method and apparatus for controlling rotor position of electric machine |
CN200710076826.6 | 2007-08-30 |
Publications (2)
Publication Number | Publication Date |
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US20080129241A1 US20080129241A1 (en) | 2008-06-05 |
US7755317B2 true US7755317B2 (en) | 2010-07-13 |
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US11/951,305 Expired - Fee Related US7755317B2 (en) | 2006-12-05 | 2007-12-05 | Methods for electric vehicle motor control and rotor position detection fault-tolerant processing |
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US (1) | US7755317B2 (en) |
EP (1) | EP2128975B1 (en) |
WO (1) | WO2008067769A1 (en) |
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WO2012115918A3 (en) * | 2011-02-24 | 2014-03-13 | Deere & Company | Method and system for determining a position of a rotor of an electric motor with noise reduction |
US20150188477A1 (en) * | 2013-12-31 | 2015-07-02 | Hon Hai Precision Industry Co., Ltd. | Control apparatus and method for controlling motor |
US10439538B2 (en) | 2016-04-29 | 2019-10-08 | Deere & Company | Method and system for estimating a rotor position with a notch filter |
US20200259433A1 (en) * | 2016-04-01 | 2020-08-13 | Beijing Electric Vehicle Co., Ltd. | Method and system for processing fault information of decoding chip in rotary transformer |
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US20200259433A1 (en) * | 2016-04-01 | 2020-08-13 | Beijing Electric Vehicle Co., Ltd. | Method and system for processing fault information of decoding chip in rotary transformer |
US10972021B2 (en) * | 2016-04-01 | 2021-04-06 | Beijing Electric Vehicle Co., Ltd. | Method and system for processing fault information of decoding chip in rotary transformer |
US10439538B2 (en) | 2016-04-29 | 2019-10-08 | Deere & Company | Method and system for estimating a rotor position with a notch filter |
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EP2128975A4 (en) | 2013-07-31 |
WO2008067769A1 (en) | 2008-06-12 |
EP2128975A1 (en) | 2009-12-02 |
EP2128975B1 (en) | 2014-08-27 |
US20080129241A1 (en) | 2008-06-05 |
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